Julius Caesar never used a mobile phone, Socrates never consulted a digital watch, and Alexander the Great never flushed the lavatory. But that doesn’t mean they were stupid. Archeologists tell us the human brain is the same size now as it was 60,000 years ago, and our ancestors were every bit as intelligent as we are today, so we shouldn’t assume that the scientists and inventors of the past have nothing to teach us. In fact, when it comes to weapon’s technology - well, none of it is as new as we think it is. Guided missiles, flame-throwers, chemical weapons, tanks, even the theory of the atom bomb - they’re all ancient inventions.